body {
    margin: 0;
    padding: 0;
    background: url('../images/bg.png') #0E2252;
    background-repeat: no-repeat;
    background-attachment: fixed;
    filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/background.jpg', sizingMethod='scale');
    -ms-filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/background.jpg', sizingMethod='scale');
    background-size: cover;
    -moz-background-size: cover;
    -webkit-background-size: cover;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-around;
    overflow: hidden;
}

.sider {
    display: flex;
    flex-direction: column;
    padding: 15px;
    width: 15%;
    height: 95%;
    background: rgba(4, 65, 136, 0.6);
    z-index: 998;
    border-radius: 15px;
}

.header {
    width: 100%;
    margin: 0 auto;
}

.header p.p1 {
    width: 60px;
    height: 60px;
    margin: 0 auto;
    margin-top: 110px;
}

.header p.p2 {
    height: 40px;
    margin: 0 auto;
    text-align: center;
    line-height: 40px;
    margin-top: 10px;
    font-size: 20px;
    color: #fec468;
}

.header p.p3 {
    height: 40px;
    margin: 0 auto;
    text-align: center;
    line-height: 40px;
    font-size: 28px;
    color: #bddde6;
}

.contain {
    flex: 1;
    overflow-y: scroll;
}

.contain::-webkit-scrollbar {
    width: 5px;
    background-color: #666;
    scrollbar-width: thin;
    scrollbar-color: #c1c1c1 #eee;
}

.contain::-webkit-scrollbar:hover {
    background-color: #666;
}

.contain::-webkit-scrollbar:active {
    background-color: #666;
}

.contain::-webkit-scrollbar-thumb {
    background-color: #0394C3;
}

.contain ul {
    list-style: none;
    padding: 0 15px 0 0;
}

.contain ul li {
    width: 100%;
    height: 40px;
    line-height: 40px;
    background-image: url('../images/kuang.png');
    background-position: center center;
    background-repeat: no-repeat;
    background-size: 100% 100%;
    margin-bottom: 10px;
    background-color: transparent;
}

.contain ul li:hover {
    background: url('../images/chooseKuang.png') center center no-repeat;
    background-size: 100% 100%;
    /*background-color: -webkit-linear-gradient(red, blue); /* Safari 5.1 - 6.0 */
    /*background-color: -o-linear-gradient(red, blue); /* Opera 11.1 - 12.0 */
    /*background-color: -moz-linear-gradient(red, blue); /* Firefox 3.6 - 15 */
    /*background-color: linear-gradient(red, blue); /* 标准的语法 */
}

.contain ul li a {
    color: #57daff;
    display: block;
    width: 100%;
    height: 100%;
    text-align: center;
    text-decoration: none;
}

.contain ul li a:hover {
    color: #FFF;
}

.contain ul li a:visited {
    color: #00EA37;
}

.main {
    width: 80%;
    height: 95%;
    overflow: hidden;
    position: relative;
    background: rgba(4, 65, 136, 0.6);
    border: solid 15px transparent;
    border-radius: 15px;
    text-align: center;
}

.main iframe {
    border-radius: 1px;
}